"Delivering comfort down to 0F, our Ascend Tsunami Mummy Sleeping Bag is a 4-season bag for hardcore campers. The nylon shell, polyester lining, and hollow-fiber synthetic fill are all made from recycled materials. This mummy bag has an anti-snag locking zipper with a draft-blocking collar, while an interior zip-close pocket is perfect for keeping your phone or other battery-powered devices warm when overnight temperatures drop. The offset layered quilt construction provides warmth and softness, while the trapezoid-shaped footbox offers ample room for your feet. The Ascend Tsunami Mummy Sleeping Bag includes a compression stuff sack. Shell: 100% recycled nylon made of 20D 40OT recycled nylon. Lining: 100% recycled polyester made of 50D 320T recycled brushed polyester taffeta. Fill: 100% recycled synthetic. Imported. Shell: 100% recycled nylon made of 20D 40OT recycled nylon Lining: 100% recycled polyester made of 50D 320T recycled brushed polyester taffeta Fill: 100% recycled synthetic Double-sliding, locking zipper Collar blocks drafts Anti-snag design Offset layered quilt Interior zip-close pocket Trapezoid footbox Compression sack Lower limit rating of 4F Comfort limit of 17FSpecs:Regular: Fits up to: 6'. Shoulder girth: 62"". Hip Girth: 58"". Packed Dimensions: 16""L x 11.4"" diameter Weight: 5 lbs. 2 oz.Long: Fits up to: 6'6"" Shoulder girth: 64"". Hip girth: 60"". Packed Dimensions: 17""L x 12.2"" diameter Weight: 5 lbs. 5 oz."